Feeling exhausted is so common that the NHS has given it its own acronym, TATT, which stands for "tired all the time".

There are a number of simple explanations for exhaustion – a young child, not enough sleep, poor quality sleep. But tiredness can be a sign of deeper issues with your health and “unexplained tiredness” is a major reason why people go to their doctor.

Before you take that step, take this test. Leaving aside the box set or the baby, chronic exhaustion may be your body’s way of telling that there’s something wrong. Major causes of tiredness are iron deficiency anaemia, under-active thyroid (hypothyroidism), and sleep apnoea\

Hs-CRP

Heart disease is usually as a result of fatty deposits in the arteries causing narrowing and poor blood supply. This blood test measures markers of inflammation specific to this process and can help to predict an otherwise well person’s cardiac risk.

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Full Iron Profile

Iron is a mineral in your body that comes from foods like red meat and fortified cereals or from supplements you take. You need iron to make red blood cells. Iron is also an important part of haemoglobin, a protein in your blood that helps carry oxygen from your lungs to the rest of your body. An iron test can show if you have too much or too little of this mineral in your system.

Ferritin - Ferritin is a protein which stores iron. This test indicates if your body's iron stores are low and you have iron deficiency or if you have too much iron. It could also point to liver disease, rheumatoid arthritis, other inflammatory conditions or hyperthyroidism.

Iron Serum - A serum iron test measures how much iron is in your serum. Serum is the liquid that’s left over from your blood when red blood cells and clotting factors have been removed. The test can reveal abnormally low or high blood iron levels. Having too much iron — or not enough — can cause serious health problems.

TIBC - Total Iron Binding Capacity - A total iron-binding capacity test tells you how much transferrin in your blood is binding to iron, which tells you how well iron is functioning in your body.

UIBC - Unsaturated Iron Binding - Unsaturated iron-binding capacity is related to the total iron-binding capacity test and measures how much transferrin is not yet bound to iron.

Transferrin Saturation - Capacity - Your liver makes a protein called transferrin that attaches to, or binds to, iron in your blood. Once iron is bound to transferrin, it goes to your bone marrow to make red blood cells and haemoglobin, a protein that helps carry oxygen.

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Kidney function test

This blood test looks at important salts in the blood which control chemical and electrical cell processes. It also gives an indication of renal function and hydration.

Creatinine - Creatinine is a waste product from the normal breakdown of muscle tissue. This test measures how well your kidneys are working.

eGFR - Estimated glomerular filtration rate (eGFR) is a measure of how well your kidneys filter blood.

Urea - Urea is a waste product our bodies produce and is the major component of urine.

Sodium - Sodium acts as the chief base of the blood where it aids in maintaining acid-base balance. It also functions to maintain osmotic pressure, aids in nerve impulse transmission, and is essential for cellular transport.

Chloride - Chloride helps maintain cellular integrity by playing a role in influencing osmotic pressure and the movement of fluid and minerals through the cell membrane. It is also essential for a healthy acid-base balance.

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Thyroid function test

Thyroid hormones help to regulate important body processes such as metabolism and brain development. Under or over-active thyroid problems can present with both physical, mental and metabolic disorders. This blood test can help diagnose thyroid problems, as well as monitor and guide treatment in established cases.

Thyroid Stimulating Hormone (TSH) - A TSH test is done to find out if your thyroid gland is working the way it should. It can tell you if it’s overactive (hyperthyroidism) or underactive (hypothyroidism).

Triiodothyronine (T3, free) - T3 is one of two major hormones made by your thyroid, a small, butterfly-shaped gland located near the throat. The other hormone is called thyroxine (T4) T3 and T4 work together to regulate how your body uses energy.

Thyroxine (FT4) - T4 is one of two major hormones made by your thyroid, a small, butterfly-shaped gland located near the throat. The other hormone is called Triiodothyronine (T3.) T3 and T4 work together to regulate how your body uses energy

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Vitamin D

Vitamin D and Calcium are important for good bone health. The blood test is used to screen for and monitor bone disorders. It can also give an indication of nutritional status, organ damage and other medical conditions.